Series of crinoid calyxes graded in size, tegmen view

Submitted by: David Thompson
Taxon: Dolatocrinus asterias
Submit date: 2008-11-23
Location (approximate): Alpena, Alpena, MI
Stratigraphy: Alpena Formation
Age: Erian (Middle Devonian)
Submitter notes: These were from bioherm areas of the Alpena Limestone

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